LA Galaxy boss Bruce Arena has warned his colleagues in MLS that “we need to slow down a little bit” and suggested league expansion could have a negative effect on home-grown soccer talent.

Last month, MLS announced plans to expand to 28 teams from its current 20, and commissioner Don Garber has talked up the prospect of MLS clubs in more and more US cities. LAFC, backed by a raft of celebrities including Mia Hamm and Will Ferrell, are the latest club to join the party, but Arena told ESPN that expansion might not necessarily be good for everyone.